package org.apache.maven.model.building;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;

/**
 * Wraps an ordinary {@link File} as a model source.
 * 
 * @author Benjamin Bentmann
 */
public class FileModelSource implements ModelSource2 {
  private final File pomFile;

  /**
   * Creates a new model source backed by the specified file.
   * 
   * @param pomFile The POM file, must not be {@code null}.
   */
  public FileModelSource(File pomFile) {
    if (pomFile == null) {
      throw new IllegalArgumentException("no POM file specified");
    }
    this.pomFile = pomFile.getAbsoluteFile();
  }

  public InputStream getInputStream() throws IOException {
    return new FileInputStream(pomFile);
  }

  public String getLocation() {
    return pomFile.getPath();
  }

  /**
   * Gets the POM file of this model source.
   * 
   * @return The underlying POM file, never {@code null}.
   */
  public File getPomFile() {
    return pomFile;
  }

  @Override
  public String toString() {
    return getLocation();
  }

  public ModelSource2 getRelatedSource(String relPath) {
    relPath = relPath.replace('\\', File.separatorChar).replace('/', File.separatorChar);

    File relatedPom = new File(pomFile.getParentFile(), relPath);

    if (relatedPom.isDirectory()) {
      // TODO figure out how to reuse ModelLocator.locatePom(File) here
      relatedPom = new File(relatedPom, "pom.xml");
    }

    if (relatedPom.isFile() && relatedPom.canRead()) {
      return new FileModelSource(new File(relatedPom.toURI().normalize()));
    }

    return null;
  }

  public URI getLocationURI() {
    return pomFile.toURI();
  }
}
